#!/usr/bin/env python
#
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from __future__ import print_function

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Verify that applying env.Tool('qt') after running Configure checks
works properly.  This was broken in 0.96.95.

The configuration here is a moderately stripped-down version of the
real-world configuration for lprof (lprof.sourceforge.net).  It's probably
not completely minimal, but we're leaving it as-is since it represents a
good real-world sanity check on the interaction of some key subsystems.
"""

import os

import TestSCons

test = TestSCons.TestSCons()

if not os.environ.get('QTDIR', None):
    x ="External environment variable $QTDIR not set; skipping test(s).\n"
    test.skip_test(x)

test.write('SConstruct', """
import os

def DoWithVariables(variables, prefix, what):
  saved_variables = { }
  for name in variables.keys():
    saved_variables[ name ] = env[ name ][:]
    env[ name ].append(variables[ name ])

  result = what()
  
  for name in saved_variables.keys():
    env[ name ] = saved_variables[ name ]
    env[ prefix+name ] = variables[ name ]

  return result

def CheckForQtAt(context, qtdir):
  context.Message('Checking for Qt at %s... ' % qtdir)
  libp = os.path.join(qtdir, 'lib')
  cppp = os.path.join(qtdir, 'include')
  result = AttemptLinkWithVariables(context,
      { "LIBS": "qt-mt", "LIBPATH": libp , "CPPPATH": cppp },
      '''
#include <qapplication.h>
int main(int argc, char **argv) { 
  QApplication qapp(argc, argv);
  return 0;
}
''',".cpp","QT_")
  context.Result(result)
  return result

def CheckForQt(context):
  # list is currently POSIX centric - what happens with Windows?
  potential_qt_dirs = [
    "/usr/share/qt3", # Debian unstable
    "/usr/share/qt",
    "/usr",
    "/usr/local",
    "/usr/lib/qt3", # Suse
    "/usr/lib/qt",
    "/usr/qt/3", # Gentoo
    "/usr/pkg/qt3" # pkgsrc (NetBSD)
    ]

  if 'QTDIR' in os.environ:
    potential_qt_dirs.insert(0, os.environ[ 'QTDIR' ])
  
  if env[ 'qt_directory' ] != "/":
     uic_path = os.path.join(env['qt_directory'], 'bin', 'uic')
     if os.path.isfile(uic_path):
        potential_qt_dirs.insert(0, env[ 'qt_directory' ])
     else:
        print("QT not found. Invalid qt_directory value - failed to find uic.")
        return 0

  for i in potential_qt_dirs:
    context.env.Replace(QTDIR = i)
    if CheckForQtAt(context, i):
       # additional checks to validate QT installation
       if not os.path.isfile(os.path.join(i, 'bin', 'uic')):
          print("QT - failed to find uic.")
          return 0
       if not os.path.isfile(os.path.join(i, 'bin', 'moc')):
          print("QT - failed to find moc.")
          return 0
       if not os.path.exists(os.path.join(i, 'lib')):
          print("QT - failed to find QT lib path.")
          return 0
       if not os.path.exists(os.path.join(i, 'include')):
          print("QT - failed to find QT include path.")
          return 0
       return 1
    else:
      if i==env['qt_directory']:
        print("QT directory not valid.  Failed QT test build.")
        return 0
  return 0

def AttemptLinkWithVariables(context, variables, code, extension, prefix):
  return DoWithVariables(variables, prefix,
                         lambda: context.TryLink(code, extension))

env = Environment(CPPPATH=['.'], LIBPATH=['.'], LIBS=[])

opts = Variables('lprof.conf') 
opts.Add(PathVariable("qt_directory", "Path to Qt directory", "/"))
opts.Update(env)

env['QT_LIB'] = 'qt-mt'
config = env.Configure(custom_tests = {
    'CheckForQt' : CheckForQt,
})

if not config.CheckForQt():
    print("Failed to find valid QT environment.")
    Exit(1)

env.Tool('qt', ['$TOOL_PATH'])
""")

test.run(arguments = '.')

test.pass_test()

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